I am using 20.2752MHz, and there must many other suitable value for 18Fxxx. ----- Original Message ----- From: "Padu" To: "Microcontroller discussion list - Public." Sent: Tuesday, November 15, 2005 9:59 PM Subject: [PIC] Capacitor for crystal I'm designing a circuit using a PIC18F452 that is going to communicate through USART at 115200bps. From the pic datasheet, I calculated that the ideal crystal for my app is 14.7456MHz (or 7.3728MHz, but I'll stick with the faster because I need the extra speed). I selected the Abracon ABLS at exactly that speed (how convenient 8^D), and on its datasheet it specifies "Load Capacitance" at 18pF and Shunt capacitance at 7pF. My questions: 1-Should I use 18pF capacitors for my circuit? (I think the real question is what's the difference between load and shunt capacitance?) 2-What's the recommended type of capacitor in this case (ceramic, tantalun, electrolytic, etc). Is SMD fine? Thanks Padu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist